Acronims' ambiquity

Hello

I am a bit confused by the acronims used in IETF drafts, e.g. in some places
SPI stands for Security Parameter Index, in others Indentifier. The same
with ESP (Payload or Protocol). There are a lot of such acronims, and
although in shown examples it does not make much difference I met several
very confusing. Is there any document specifying the use and meaning of
acronims?

Regards
Salavat R. Magazov

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